8000 bpo-44524: Don't modify MRO when inheriting from typing.Annotated by Fidget-Spinner · Pull Request #27841 · python/cpython · GitHub
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bpo-44524: Don't modify MRO when inheriting from typing.Annotated #27841

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Merged
merged 5 commits into from
Aug 25, 2021
Merged

bpo-44524: Don't modify MRO when inheriting from typing.Annotated #27841

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ce19238
exclude Annotated from _name temporarily
Fidget-Spinner Aug 19, 2021
a943fce
stricter tests
Fidget-Spinner Aug 19, 2021
f26b866
Merge remote-tracking branch 'upstream/main' into name_annotated
Fidget-Spinner Aug 21, 2021
1cebc04
fix tests, remove news
Fidget-Spinner Aug 21, 2021
ba279d2
__name__ for Annotated is 'Annotated'
Fidget-Spinner Aug 21, 2021
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exclude Annotated from _name temporarily
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@Fidget-Spinner
Fidget-Spinner committed Aug 19, 2021
commit ce1923882982cb3296dc2a6cb54235e6355d1337
7 changes: 6 additions & 1 deletion Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4568,6 +4568,10 @@ def test_annotated_in_other_types(self):
X = List[Annotated[T, 5]]
self.assertEqual(X[int], List[Annotated[int, 5]])

def test_annotated_mro(self):
class X(Annotated[int, (1, 10)]): ...
self.assertNotIn(Generic, X.__mro__, "Annotated should be transparent.")


class TypeAliasTests(BaseTestCase):
def test_canonical_usage_with_variable_annotation(self):
Expand Down Expand Up @@ -4908,7 +4912,8 @@ def test_special_attrs(self):
typing.TypeVar: 'TypeVar',
typing.Union: 'Union',
# Subscribed special forms
typing.Annotated[Any, "Annotation"]: 'Annotated',
# Fixme: make Annotated work without messing up its MRO
# typing.Annotated[Any, "Annotation"]: 'Annotated',
typing.ClassVar[Any]: 'ClassVar',
typing.Concatenate[Any, SpecialAttrsP]: 'Concatenate',
typing.Final[Any]: 'Final',
Expand Down
2 changes: 1 addition & 1 deletion Lib/typing.py
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Expand Up @@ -1578,7 +1578,7 @@ def __init__(self, origin, metadata):
if isinstance(origin, _AnnotatedAlias):
metadata = origin.__metadata__ + metadata
origin = origin.__origin__
super().__init__(origin, origin, name="Annotated")
super().__init__(origin, origin)
self.__metadata__ = metadata

def copy_with(self, params):
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2021-08-20-01-46-29.bpo-44524.TbOZD8.rst
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@@ -0,0 +1,2 @@
Temporarily remove ``__name__`` and ``__qualname__`` from subscripted
:data:`typing.Annotated` to maintain MRO.
0